Ribbon mechanism for type-writers.



PATBNTED JULY 17, 1906.

8. W. DONNING. RIBBON MECHANISM PSR TYPE WRITERS.

APPLIUATIGH PKLED JUNE 21. 1901.

'i EEEETS-SHEBTX PAT'ENTED JULY 1'7, 1906.

a. w. BURNING. RIBBON mcmmsm FOR TYPE WRITERS.

APPLIUATIDN FILED JUNE 21, H901v 'I SHEETS'SHBEZ I 3 Wig? m E: v m

m M Hfm m 2 m m n-mm m n n Hllllllllll ass-1a:

j J w HH Z IHA HEA 4 Eu:

i WV}? No. 820,481. 'PATENTED JULY 17, 1906,

G. w. momma. RIBBON MECHANISM FOR TYPE WRITERS.

APPLIOATIQN FILED JUNE 21 1901.

7 8HEITS SHEET i il-liJ m Geovse. W13 mm m5.

510,826,481. PATENTED JULY 1?, 1908.

G. w. DONNING. v RIBBON MECHANISM FOR TYPE WRITERS.

APPLIGATLON FILED JURY 21.1901! sum r siizm' las) No. 826,481. 7 ?ATENTED JULY 17, 1906.

. G. W. DQHNING. RIBBON MECHANISM FOR TYPE WRITERS.

APPLIGATIGR Iiiiiill JUNEQI, 1901.

T 8HEETSSHEBT 6 a 5.. m 46 n) 4' No. 826,481. PATBNTED JULY 1'7, 1906. G. W. DONNING.

RIBBON MECHANISM FOR TYPE WRITERS APPLIOATION YILED JUNE 21.1901

7 EHEBTS SHBBT q- I fl a ed on the platform 22'.

pinion is provided with an upward-extemling neck portion a encircling the shaft and expanded at its upper end into the platform 22*. (See Figs. 4, 5, and 6.) Loosely inelosing the shaft and rotatable on said platform is a ho]- low head a, and rigidly secured to the shaft within this head is a ratchet-wheel a which is adapted to be engaged by a pawl a, pivot- A broken annulus a is secured to the inner peri hery of the head and is so arranged that w men the head a is rotated, as indicated in Fig. 5, one end of the broken annulus takes behind the tail of the pawl and forces the latter out of engagement with the ratchet. When the annulus is shifted to the position shown in Fig. 4, a spring 0 borne on the inside of the annulus, bears against the front of the tail of the pawl and forces said tail out into the broken-away portion of the annulus and the head of the pawl consequently inward into engagement with the ratchet.

' of the core. The spool is adapted to be locked to the core by means of a ball or roller a working in a semiert cent-shaped opening a? for led in the inner surface of the s ool. It will be understood that Fig. 15 SIUWS the left-hand spool and that in the opposed right-hand spool the opening a. is reversed, the result of this arrangement being that when either of the shafts a rotated to wind up the ribbon on its spool this spool is locked to its core by reason of the ball becoming wedged in the narrow end of the chamber a,

while the movement im arted to the opposite 001 through the travell of the ribbon causes t iis spool to be similarly locked. If, however, it is desired to take u a consider) le amount of slack in the rib onv or to wind the ribbon on one of the spools for any purpose, this may be accorn hshed manually by rotating the spool at the time connected with the driving mechanism in the direction of the intermittent ribbon-travel or the other spool in the direction contrary to such travel. Duringsuch manipulation it will be readily un derstood the ball a rolls into the large end of the c iamber a permitting the spool to rotate independently of its support and the driving mechanism.

The coiled spring a, constitutes means for permitting the yielding of the ribbon under the impact of the type, thereby saving the ribbon from unnecessary wear, and also for automatically taking up the slack in the ribbon after the type-impact, it being obvious with shaft 11".

that during all these movements the spools will be locked to their cores and, therefore, in operative connection with the springs.

In order to permit the ribbon-spools to be shifted axially to present new portions of the ribbon. or rather new paths on the ribbon, to the descending type, I mount the shafts a for longitudinal movement in gears a, as already described. Knobs a are shown formed on the front ofthe spools to afford manual means for so shifting the ribbon, and for the purpose of synchronizing the movement axially of the two shafts a. at. opposite sides of the machine I provide a transverse shaft o rigid with which are depending arms (1, having bifurcated ends a, which straddle the reduced portions-e of the shafts. While the shafts may ordinarily be relied upon to maintain their several longitudinal positions, I may )rovide means, as indlcated in Fig. 2, for retaining the shafts at any one of a number of predetermined points. of pro traction. As shown this means consists in a flat spring a, which is secured to a transverse rod 17" and bears at its lower end against any oneof a number of flattened retaining-faces a formed on a collar 18, rigid By this arrangement the spools may be retained at different axial positions to disposed different writing-paths over the printing-point or to remove the rib bon entirely from above said printing-point for the. purpose of securing visibility. In Fig. 10 is illustrated a modified form of this feature of my invention. Here the shaft o is provided with a rigidly-atfacl'ied rearwardextending arm 0' to which is secured one end of a coiled s )ring a tensioned so as to protraet the shafts of Pawls (1 ivoted to the side walls A of the carriage anrl arranged to engage with reduced regions o on the shafts (I, retain the shafts at the desired oint. in Fig. 11 is illustrated a further mori'ficationin which the coil-spring a)" encircles the shaft (1, hearing at one end against the hub of gear a? and at the other against a collar on the shaft.

It will be readily understood that in the form of my invention illustrated in Figs. 1, 2, 3, 10, and 11 the intermittent longitudinal feed of the ribbon is effected through the engagement of the pinions a. with the rack AF, the pinions moving with carriage A in its step-by-step letter-spacing n'iovement alon the stationary rack. In Figs. 7, 8, and 9 i have shown a construction in which the intermittent feed of the ribbon is effected directly by the key-levers. Beneath the bank of print1ngkeys a is disposed a rod a, carried by arms a, which are pivoted intermediate .their length and connect at their inner ends by means of )ins rt" and slots (1 with vertical reci )rocable rods a, mounted on the outside of pfates A Beneath the space-key a is a rod 11", carried by intermediately- 4 diet a force exerte means for permitting slight 'elding of the spooldiotinct from its norma movement at eat-b impact of a type, whereby leek of a. ribbon carried by the spool iisperinittet said nu-unn operating autonmtiool y npon the-return stroke of the type to compensate for such yielding movement, nubstnntinlly on denerib'ell.

13. in a ribbon mechanism, the combination with a \vfiting mechanism including.

typonwnns For rotating of sand spools for 'lnovenient oi the spools, substantially ll); de-

scribed.

H. in a ribbon ineebmiism, the combination of a ribbon-spool, n member upon w said spool is mounted, driving mechanism for intermittin ly rotating Said member to efi'eet feeding of t w. ribbon, means for looking the filpoul aga'mst'rotation upon sa d member in a ireotion opposite to driving and for permitting such relative rotation in the opposite direction, and independent means for permitting slight rotation of the spool in a direction oppositeto (lrivin independent of the driving mechanism on stuntially as desembei l.

'15. In it ribbonmechanism, the combination of a ribbon-spool, a member upon which said spool is mounted, drivingnieelmnisni, jor intermittin ly rotating said member to efieet'feeding (ii the ribbon, means for looking the spool against I'Ottlblflll upon said membet in' a direction opposlteto rlvlng and for permitting such relative rotation in the opposite direction, and independent means for permitting a slight rotation of said spool on d in the direction opposite to the driving movement and for autonnitically reversin the force, su

16. In a. ribbon mechanism, tion with a. rock, ,a pinion 'meshmg wit li the reek, a. shaft loosely encircled by sfnd pinion and a ribbon-s on driven from and shaft; l

istantinlly as described.

, araitehet-whee seenred to said shaft, a pawl ivoted upon the pinion, lilo in one; direction to engage .the.pawl with the ratchet and in the-opp disengage ittherefroin, substantially as described; m v I 17. In a. rlbbon mechanism, the oonrbmntion with a melt, a pinionmeshmg with the auoh'rotetion upon removal of the conibinn-.

uaite direction to and a head rotntations.

reek, a shaft loosely encircled by said pinion and a ribbon-spool driven from said shaft; 0 oratdhet-wheel secured to said shaft, erpmvl pivoted u onthe pinion, and a hollow rotatais head musing said pawl and: ratchet and provided with mean for engaging and diseng ing the pawl with the retel1et,--substontialy on described. 7

IS. in a ribbon mechanism, the combination with a rock, a pinion meshing with the reek, a shaftloimely encircled by said pinion, and o ribbon-spool driven from said shaft; of n ratchet-wheel secured to said sln'tft, a pawl pivoted upon the pinion, n hollow rotatable maul, abroken annulus earriod by suidhend, and a spring also carried thereby, the spring beinghrmngud to engage withthe' pawl to hold it in engagement with the ratchet while the pawl in renewed in the eut away portion oftbo to form: the pawl out of ratchet when the sprin gngeinent with the pew snribed.

19. 1n a ribbon mechanism, the combination with opposed ribbomspools rotatable to eilc-vt ribbon-Feed n'nd slnftnble axially to carry the ribbon widtbn'ise, of spool-shiftin arms piwned and connected to insure simu tnneous movement thereof, imd'a Halt sprin 1 member friotionnlly associated with sai nrnn-i to retain them in a plurality of posinnnnlns nnd tbeannulusbeing arranged engagement with the inmoved out of en'- substantinlly as de- 30. inn ribbon mechanism, the combination with opposed ribboms mols rotatable to effect ribbon-feed and nhiftnble axially to entry the ribbon widtbwise, of pivoted spoolsbilting nuns, a connecting pivot-rod ri 'd with said arms, and e llatsmng niomi iizt bearing against saidpivot-rm to retain the ports in e-plnrnlity of shifbcd'positions.

21. In'n ribbon mechanism, the combine tion with o posod opoo I feeding of tin: ribbon and sliiftable axially to early the ribbon widtbivise, of spool-shiftin ruins, it cunneoting pivot member-rigid wit mild arms and provided with a plurality of retui ning-faiws, and a spring meinberarra ed to engage one or other of said feces where y different lon 'tndinel writingqmths'on the is rotatable to client IIO ribbon nun" we oi-iitionedovel' the prjnt-ing- GEORGE W. DONNING.

Witnesses:

HENRY, Bmnntn, W. L. Biennium. 

